Dummy text generators

http://www.lipsum.com/ - bog standard lorum ipsum text

http://html-ipsum.com/ - a great sample html generator

CSS3 and HTML5 compatibility help

On http://caniuse.com You can search for a css property, it’ll tell you what browsers support it and any prefixes needed for support in some browsers (like –moz-gradient), and links to some groovy on-line editors that let you play with sliders to create some CSS effects and give you the resulting CSS code, and also links to related resources like IE workarounds.